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Stimulus--response relationships during locomotion

S Rossignol, C Julien, L Gauthier

    Canadian Journal of Physiology and Pharmacology
    |July 1, 1981
    PubMed
    Summary
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    Crossed hind limb responses in cats depend on the phase of locomotion and limb position. Both central and peripheral factors influence these motor patterns during walking and fictive locomotion.

    Area of Science:

    • Neuroscience
    • Locomotion studies
    • Motor control

    Background:

    • Crossed hind limb responses are crucial for locomotion.
    • The interplay between central and peripheral mechanisms in modulating these responses is not fully understood.

    Purpose of the Study:

    • To investigate the influence of different conditions on crossed hind limb responses.
    • To elucidate the role of central and peripheral factors in selecting these responses during locomotion.

    Main Methods:

    • Stimulation of the superficial peroneal nerve in cats under various conditions.
    • Experiments conducted on precollicularly decerebrate and acute spinal cats.
    • Induction of fictive locomotion using nialamide and L-DOPA.

    Main Results:

    Related Experiment Videos

    • Stimulus trains evoked phase-dependent crossed extension and flexion responses during treadmill locomotion.
    • Clonidine administration in spinal cats resulted in stimulus-evoked crossed extension or flexion based on limb positioning.
    • During fictive locomotion, the stimulus modulated the amplitude and duration of crossed flexor/extensor activity, sometimes out-of-phase with the central rhythm.

    Conclusions:

    • Crossed hind limb responses are selected by a combination of central and peripheral mechanisms.
    • Locomotion phase and limb positioning are key factors in determining the nature of crossed responses.